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Troubleshooting Guide for Magnetic Level Gauge Columns Not Following Liquid Level Changes
Time：
2026-04-03
Magnetic level gauge, with their intuitive and reliable characteristics, are widely used for level measurement in various storage tanks and process vessels. Their core principle is based on magnetic coupling to drive the tilting column: as the float rises and falls with the liquid level, the magnetic field generated by the internal magnet causes the external tilting column to rotate 180 degrees, thus displaying the liquid level position in red (or white).
However, in actual use, sometimes a phenomenon occurs where the liquid level has changed significantly, but the tilting column remains stationary, a phenomenon known as "non-following." This is usually caused by the following three reasons:
1. Float jamming or damage
This is the most common cause. When the float moves in the medium for a long time, its surface may absorb ferromagnetic impurities (such as welding slag or rust), or become coated with crystallized or viscous media, causing the gap between the float and the inner wall of the float cylinder to narrow or even become jammed. When the liquid level rises or falls, the float cannot move accordingly, the position of its internal magnet naturally remains unchanged, and the tilting column cannot tilt. In addition, if the float is corroded and perforated, causing liquid to enter and lose buoyancy, it will sink to the bottom and become stuck, also causing this malfunction.
II. Demagnetization or Reversal Obstruction of the Flip Column
The magnetic material inside the flip column may demagnetize after exposure to high temperatures, strong magnetic field interference, or prolonged use, preventing it from being driven to rotate by the magnetic force of the float magnet. Simultaneously, if the flip column support deforms or experiences increased resistance due to moisture or corrosion, it can also cause the flip column to rotate sluggishly, resulting in a "partially flipped" or completely unable to rotate.
III. Influence of Media Characteristics and Operating Conditions
Excessively high viscosity of the measured medium (such as heavy oil or certain slurries) will significantly increase the resistance to float movement, causing a lag in response. If a large number of solid particles are present in the medium, they may settle at the bottom of the float, burying the float. Furthermore, excessively rapid changes in liquid level, exceeding the float's ability to follow the changes by gravity or buoyancy, can also cause a temporary display lag.
Troubleshooting and Handling Suggestions
When encountering this fault, the principle of "from the outside in, from simple to complex" should be followed. First, use a magnet to move up and down along the outside of the flip column to check if the flip column itself can rotate normally. If the float can flip, the problem is likely due to a stuck float, requiring removal and cleaning of the float cylinder. If the external magnet also fails to drive the flip column, check for damage or demagnetization of the flip column assembly. When handling flammable or explosive media, always ensure that operations comply with safety regulations.
In summary, regular cleaning of the float cylinder, using floats made of corrosion-resistant materials, and preventing the entry of impurities are key to preventing this type of malfunction. Only by ensuring the float moves freely and the flip column has good magnetism can the magnetic level gauge stably and faithfully "follow" changes in the liquid level over a long period.
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